EitherSemigroup
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package algebird
Returns an instance of
T calculated by summing all instances in iter in one pass.
Returns an instance of
T calculated by summing all instances in iter in one pass. Returns None if
iter is empty, else Some[
T].
instances of
T to be combined
None if iter is empty, else an option value containing the summed
T
Either semigroup is useful for error handling. if everything is correct, use Right (it's right, get it?), if something goes wrong, use Left. plus does the normal thing for plus(Right, Right), or plus(Left, Left), but if exactly one is Left, we return that value (to keep the error condition). Typically, the left value will be a string representing the errors.